Yeah this is probably the bulk of it.
Jones was highly regarded by the eye test - everyone knows he was elite, people in context knew he was awesome out there. But people don't necessarily accept the run values that the defensive metrics give him, as gospel.
I don't know if this is true (would have to run a simple regression) but I feel like, historically, outside of a small amount of shortstops and maybe a couple of catchers, not a lot of players get into the Hall with the bulk of their case built on defense.
A good amount of players in there are elite hitters.
A good amount of players in there are great hitters + good defenders.
Comparatively less are perhaps great defenders + just good hitters.
Jones has a 111 career wRC+. That's just good. That's it.
He has more than twice as many lw runs from defense in his career. 121.6 hitting and 276.4 from defense.
It would be interesting to see how this compares to, say, hall of fame outfielders. The ratio.